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@geiten iftatee liatrnt @fitta Letture Patent No. 62,545, dated .March5, 1867.

IMPItUlEll/IENT IN DOOR LGKS.

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TO ALL WI-IOM IT MAY CONCERN:

Be it known that I, yFRANK F. LANDIS, of the city of Lancaster, in thocounty of' Lancaster, and State ot' Pennsylvania, have invented a newand improved arrangement in the manufacture of a Burglar-Proof Lock andLatch combined; and I do hereby declare that the following is a full andexact description thereof, reference being had to the accompanyingdrawings, making a part of this specification, in which- Figure l is aview of the interior parts of the lock; the covering pla-tn.

Figure 2, being removed.

Figure 3 shows the several parts in detail- I. The key 0, with itswingN, and pins, a n, on both sides;

II. The under side of the kmain bolt B, with its lock flange K,spring-pin L, and lugs M, on its forked terminus;

III. The twin-bolts C D, on their pivot F, and the double spring E, onthe pins e e, and in contact with the up'per heels on the twin-bolts;`

IV. The key-guard, Jj, showing the headed pins e e; v

V. The dead latch and open latch foot bolt G, on its pin, surrounded bya coiled spring, 7L.

Figure 4, the front edge ofthe lock, with the turning knobs in place.

The object of this invention is to supply a lock and latch in one,applicable for a right or left-hand door; and when locked, to prevent itbeing unlocked with any other but the proper key, expressly made for it;and the liability of takingr a cast for a false key, or of picking thelock by any means, prevented; and again, securing it in such a manner onthe inside that the door cannot be unlocked from the outside with theproper key itself; hence, it is emphatically burglar proof.

To enable others skilled in the art to make and use my invention, I willproceed to described its construeA tion and operation.

In the box and knobs, with the square shank and tumbler, there is no4special novelty; the main bolt, B, with its `bifurcation and luge, M,operated by the knobs and Wings t of the tumbler T, in the ordinarymannerL It has, however, a pin Il, to whichV a spiral spring, S, from apeg, s, on the lock, (or inner side of the casing plate A,) forms aconnection and draws the bolt forward to lock or simply latch the door,after being turned back by the knob, in order to open the door. So farit is an ordinary turn latch. This bolt, B, has a side flange, K, which,with the spring peg Ir, rests upon the base of the casing, as also thethickened head of the bolt, leaving a space between the bottom of thecasing plate A and bolt B, partially' covering the horizontal twin-bolt,C D,/on their pivot Ff I/art III, lig. 3, shows those twin-bolts, one ontop of the other, with their widened anges resting upon theguard-chamber J with their lower limbs, while their upper limbs areacted against by a double spring, E, on the ends :c y, andl held inplace. Each of said twin-bolts hasialso a foot, c d, Which-'rests uponthe double inclined head II of the thuu1b-lever G, with its spiralspring L around the pivot or pin on which it mores. The guard-chamber Jjcompletely encloses or surrounds the key-hole, `admitting no access tothe interior of the lock except by two small holes drilled through thethickened top. Into each of these holes a headed peg, e z, is inserted,directly underneath the ilanges C D of the twin-bolts, each onerespectdivcly, and acting independently or simultaneously in raising one orboth. False holes may also be drilled to deceive in the attempt to takea cast. The pins, 1t fa, on the key O, must be of'the exact length andposition to match the holes for the headed pins e Z, so as to raise themso high only (both simultaneously) as to' allor.u the flange K, on themain bolt Il, to slip through betwcenthe footed legs et' the twin-bolts;otherwise, il' raised too high, the ilange will strike the lower orinside shoulders :t 1/ ofthe lower leg on the twin-bolts, as it does theupper inside shoulder on the` upper legs when they rest upon the 'op ofthe guard-chamber J. vThe door would necessarily be again locked themoment the key is withdrawn, or itv action closed. So also with theknobs, which must be employed jointly with the action ofthe key, to turnthc bolt back when the twinbolts are in position to admit of the passageofthe ilange K between their forked and footed ends a: Duringr the day,when it is desirable to usc it as a latch only, then the twin-bolts areraisca by the thumb-lever G, by thc action of the double inclined planeH against the under side of the feet c (Z, one foot on each of Saidtwin-bolts of uniform size, operated in unison. In this position thebolt can be turned back, and the inclined plane, w u', on the jam-plateor box W, fig. l, will allow the door to be closed by a simple push orpull, as any ordinary latch,

I have also introduced an additional security in case the key is lost orstolen, to prevent the door from `being unlocked with it from theoutside, which consists in a thumb-lever, U, on a pcg and spring, tokeepit in place. This has an interior hook end, made to press upon theprolonged flange D of the under twin-bolt, and confines it to a positionthat will el'eetually prevent the action of the bolt by .either the keyor other thumb-lever G, or turn handles, and is only used at night, orwhen desired for special reasons.

I um aware that numerous devices are in use and patented,separatelyrconsidcred, embra sing-similar features, variously combinedand modified, therefore I do not/deem. it safe to claim any one thing orpart exclusively. Nor would I confine myself to horizontal twin-bolts,asI have also invented a lock in many respects similar, having-verticaltwin-bolts, being, however, more diicult to it up. I have improved myformer lock in the manner herein presented, which has many advantagesover the former.

What I claim as-my invention, and desire to secure by Letters Patent, isl 1. I claim the two-legged twin-bolts, one up'on the other, held by' apivot, F, each 'ha-ving a raised flange, C and D, and projecting feet,and y, and c and d, in combination'with the double-noting spring E, allarranged in the manner and for the purpose specified.

2. I also claim the guard-chamber Jj, surrounding the key-hole, with itsperforations for the headed pins z z, in combination withv the flanges Cand D, on the lower leg ofthe twin-bolts, arranged and operating in themanner and for the purpose specied. i

3. I-also claim the twin-holt fastener or lever U, in combination withthe prolonged flange D on the lower twin-bolt, when applied inthe-manner and for the purpose set'forth.

4. I also claim the construction of" the key N, with its projecting pinsn n, in combination with the headed pins 2 z, and guard-chamber Jj, allarranged and operating in the manner specified.

- FRANK F. LANDI'S.

Witnesses:

WM. B. WILEY, JACOB STAUFFER.

